Theory
Spares Calculator utilizes the most widely accepted spare parts optimization models and is validated in literally thousands of trials.
Spares Calculator offers a scientific way to forecast spare parts. It is fully validated and is based on industry standard models. Best of all, it is easy to use and gives unbiased data that you can use to support your plans, bids, supplier evaluation reports or presentations.
Spares Calculator has given us a scientific way to work out how many spare parts we need. We tested Spares Calculator on a random sample of 20 line items used in our 12 operations spread across Asia. The results were amazingly accurate. We now have an enterprise licence and use Spares Calculator in all of our procurement and operational planning projects.
Mathematical Models
Spares Calculator uses models based on the logarithmic-Poisson distribution. These models were derived for the US DoD by the Rand Corporation over 40 years ago. They are the most widely accepted models for optimizing spare parts and are used in nearly every spare parts program on the market today.
See the papers below for more information.
- The (S-1, S) Inventory Policy Under Compound Poisson Demand, Feeny and Sherebrooke, The Rand Corporation, 1966.
- METRIC: A Multi-Echelon Technique For Recoverable Item Control Sherebrooke, The Rand Corporation, 1967.
High Accuracy
Spares Calculator can be used on equipment that has a stable MTBF. It does not work on equipment in the infant mortality, or wear out regions of life. Fortunately, advances in statistical process control and production screening mean that it is usually correct to assume that equipment has a stable MTBF.
Validation
You can be confident that the results from Spares Calculator are correct. The accuracy has been proven in over 2000 trials against credible reference texts and real life scenarios.
These include:
- U.S. Navy, Reliability Engineering Handbook, NAVAIR 01-1A-32
- B L Hansen, Quality Control, Prentice Hall Inc. Englewood Cliffs
- U.S. Navy, Maintainability Design Criteria Handbook for Designers of Shipboard Electronic Equipment, NAVSHIPS 94324
Download the free trial today!
If you buy, sell or manage spare parts inventory then Spares Calculator is an essential purchase! But don’t just take our word for it. Find out for yourself. Download the free Spares Calculator trial today.